HELLER 



Tropidurus grayi BOUL., Cat, II, p. 172, 1885 (part). COPE, Proc. U. S. 



Nat. Mus., xn, p. 145, 1889 (part). BAUR, Biol. Centralbl., x, p. 475, 



1890. BOUL., Ann. N. H. (6), vii, p. 502, 1891 (part). BAUR, Fest- 



schr. Leuckart, p. 265, 1892. 

 Tropidurus indefatigabilis BAUR, Biol. Centralbl., x, p. 476, 1890 and 



Festschr. Leuckart, p. 268, 1892. 

 Tropidurus albemarlensis BAUR Biol. Centralbl., x, p. 476, 1890, and Festschr. 



Leuckart, p. 269, 1892. 

 Tropidurus jacobii BAUR, Festschr. Leuckart, p. 268, 1892. 



Range. Galapagos Archipelago ; Charles Island (Darwin, Kin- 

 berg, Baur) ; Indefatigable (Kinberg, Hassler, Albatross 1888, Baur, 

 Hopkins Stanford Exped.) ; James (Hassler, Albatross 1888, Baur, 

 Hopkins Stanford Exped.); Jervis (Hassler, Baur); Albemarle 

 (Hassler, Cookson, Albatross 1888, Baur, Hopkins Stanford Exped.). 



Specific Characters. Sides of neck granular with numerous folds 

 between ear opening and anterior oblique fold. Scales in circumfer- 

 ence 58 to 68. Considerable variation in coloration but tail never red ; 

 underparts usually light; females plain olivaceous above. Males less 

 than 100 mm. in length of head and body. 



Head plates variable but never as divided as in T. bivittatus. 

 Frontal usually small ; prefrontals large, commonly four. Internasals 

 not usually confluent with prenasals. Supraoculars five to seven, vary- 

 ing much in shape. Sides of neck granular and much folded, there 

 being two oblique folds on side of neck and several irregular folds 

 behind the ear opening. 



There is much individual variation in size and coloration, especially 

 in the specimens from Albemarle where the conditions of vegetation 

 and moisture are so various. Individuals inhabiting the barren black 

 lava fields and living only near the coast are usually larger and darker 

 than those found in the brush-covered areas. On islands where there 

 is little diversity of conditions, as on the Seymours, the individual 

 variation is correspondingly less. The specimens from the different 

 islands comprising the range of this species show a little local variation 

 but individual variation is so great that it is almost impossible to define 

 the former. 



Charles Island. Baur's description of his only specimen from 

 the type locality, a female, agrees in coloration and scale counts with 

 some females of T. g. grayi from James and Seymour from which 

 form the Charles Island specimens are perhaps not separable. Tropi- 

 durus is apparently now almost extinct on this island where formerly 

 it was not uncommon. Its extinction is probably due to the introduction 

 of domestic animals, chiefly cats, which have spread over the whole 

 island and feed on the lizards. Three days were spent, in May, 1899, 



